Thioglycollic acid compound



diurn' carbonate is added i L salt. l ?h1 s is then treated with one molecu- Patented Oct. 4, 1927.

UNITED. STATES PATENT OFFICE.

EDWARD LYONS, OF DETROIT, MICHIGAN,

nssmnon 'roranxn, DAVIS & 00., or DE- TROIT, MICHIGAN, A' CORPORATION OF MICHIGAN.

THIOGLYCOLLIC ACID COMPOUND.

No Drawing.

I thioglycollate,

SCHzCOOM 1? sornoooM where M represents hydrogen, sodium or other metal which can replace hydrogen.

/The substance indicated above when in'the form of its sodium salt is golden yellow in color. It is very soluble in water and gives an alkaline reaction (towards phenolphthalein). Dilute acids precipitate the acid substance which again dissolves in alkali. Con,- 25 centrated acids decompose the compound.

The following method may be used in the preparation of the new compounds.

1 To two molecular equivalents of thiogly- .collic acid in an equal volume of water, so-. to make the sodium lalr d'uivalent of lead hydroxide. The hydroxi e dissolves at once and heat is applied to prevent precipitation. The reaction mixture is next filtered into a large 'volume'of a suitable organic precipitant, such for example as methyl alcohol. Ether is then added to complete the precipitation. The precipitate is removed from the mixture in the usual manner and when dried appears as a light golden yellow powder, having a lead content of: about 46%, whereas the theoretical content according to the gformula above is 47.83%. By redissolvin in water and reprecipitation as described a ve or by conversion to the acid substance, redissolv- Application filed May 3,

- v lead compound,

1926. Serial No. 106,553.

ing carefully in sodium hydroxide and precipitation or by evaporation to ess a practically pure substance is obtaine While in the above description I have mentioned specifically the sodium salt of lead thioglycollate it is to be understood that 'my invention also includes other homologous compounds derived from lead .and the thio acids which come within the scope of the claims appended hereto.

What I'claim as my invention is:

1. An organic lead com ound derived from the action of thioglyco lic acid and a lead compound.

2. An organic lead compound derived from the action of a thioglycollate and freshly prepared lead hydroxide.

3. An organic lead compound containing lead and the thioglycollic acid radical (SCILCOOM) where M is hydrogen, sodium or other metal that can replace hy drogen.

4. An organic lead compound 'derived from the action of thioglycollic acid and a said compound possessing the robable structural formula Pb (SCI-I CO M) other metal which can replace hydrogen.

5. As a new composition of matter, the substance represented by the following structural formula Pb S CH:C OONa S 01110 O 0N9.

said substance being of golden yellow color, soluble in water, and alkaline in reaction towards phenolphthalein.

6. The process of preparing a lead compound of thioglycollic acid which consists in treating thioglycollic acid with freshly prepared lead h droxide in the presence of sufficient alkali to form the sodium salt of the compound, and precipitating the organic lead compound from the solution.

In testimony whereof I aflix my signature.

EDWARD LYONS.

where M is hydrogen, sodium or 

